[Q] Bluetooth won't enable after OTA 4.2 update

Just done 4.2 update after I was offered it.
However my Bluetooth now will not enable. The notification bar Bluetooth icon highlights but goes back to grey, the on/off slider in settings immediately goes back to off and the power widget BT icon does nothing.

Any ideas? Searched the board but all i could find were people with stuttering issues, not complete failure to activate bluetooth.

From what I've read the solution is to flash the factory image instead, or possibly just factory reset the phone.

But be aware that even with a cleanly flashed phone, BT has major issues in 4.2. Stuttering audio, disconnects, etc. Not everyone seems to be affected by this for whatever reason, but the new BT stack is definitely no hit.

i know this thread hasnt been updated in a while but for anyone finding this thread through various searches, the fix to try if you are rooted is linked below. It appeared to be a simple permissions issue

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